class Student {
    fullName: string;
    constructor(
        public firstName: string,
        public middleInitial: string,
        public lastName: string
    ) {
        this.fullName = firstName + "" + middleInitial + "" + lastName;
    }
}

interface Person {
    firstName: string;
    lastName: string;
}
function greeter(person: Person) {
    return "Hello，" + person.firstName + " " + person.lastName;
}
let user = {firstName: "Jane", lastName: "User"};
document.body.innerHTML = greeter(user)




